[R-390] R-390 and CV-157 timeframe

[rbethman]

Before the R-390(x) package, there was the big rack of Northern Radio 
diversity modified SP-600s with LMO to control frequency, and whatever 
else was in those racks.

Bob - N0DGN

William J. Neill wrote:
> One R-390( ) + one CV-157 = AN/FRR-40
> 
> Two R-390( ) + two CV-157 = AN/FRR-41 (one R-390 per CV-157)
> 
> Bill Neill
> Conroe, TX
> 
> On May 20, 2008, at 4:15 PM, Roy Morgan wrote:
> 
>>
>> On May 20, 2008, at 9:03 AM, Sheldon Daitch wrote:
>>> The CV-157 has an AFC circuit,
>>
>> I seem to remember someone who WAS there telling that the CV-157 came 
>> out after the R-390/URR but before the R-390A/URR. It was used in a 
>> diversity setup with two R-390/URR radios.
>>
>>> someone in systems design recognized a need for the AFC
>>> circuit in the CV-157.
>>
>> I would guess that use of multi-channel, independent sideband RTTY 
>> broadcasts came after the R-390A was in use and available.
>>
>> The R-1051 and that monster National receiver with two cabinets joined 
>> above one another were designed with the needed stability built in.
>>
>> Also, Nike missile sites were equipped with transmitters (and 
>> presumably receivers) fed from a then state of the art master 
>> oscillator, known as The Sulzer frequency standard.  I'd guess that 
>> the Nike sites were silent, and maybe the central control stations 
>> were also, and they needed the transmitters and receivers to come up 
>> ON frequency, without doubt or any pre-broadcast frequency checks or 
>> tune-up periods.
>>
>> Roy
>>
>> Roy Morgan
>> k1lky at earthlink.net
>> Lovettsville, VA 20180
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